초록 ▼

A composition and method for preparing it is disclosed. The composition in a blend of a cured fluoroelastomer which except for the cure sites is a perfluorocarbon and a thermoplastic copolymer of tetrafluoroethylene which is present as generally spherical particles having a particle size of less tha

A composition and method for preparing it is disclosed. The composition in a blend of a cured fluoroelastomer which except for the cure sites is a perfluorocarbon and a thermoplastic copolymer of tetrafluoroethylene which is present as generally spherical particles having a particle size of less than 10 microns. The composition is prepared by blending the fluoroelastomer and thermoplastic copolymer at a temperature above the melting point of the thermoplastic copolymer followed by curing the fluoroelastomer.

대표청구항 ▼

A melt blended composition comprising (A) 100 parts by weight of a cured fluoroelastomer consisting essentially of from 79.9 to 52 mole % units derived from tetrafluoroethylene, 20 to 45 mole % units derived from a perfluoroalkylvinyl ether wherein the alkyl group contains from 1 to 10 carbon atoms,

A melt blended composition comprising (A) 100 parts by weight of a cured fluoroelastomer consisting essentially of from 79.9 to 52 mole % units derived from tetrafluoroethylene, 20 to 45 mole % units derived from a perfluoroalkylvinyl ether wherein the alkyl group contains from 1 to 10 carbon atoms, and 0.1 to 4.0 mole % cure site monomer units derived from vinyldiene fluoride, trifluoroethylene, vinyl fluoride, CH2〓CHRf where Rf is a perfluoroalkyl group containing from 1 to 5 carbon atoms, perfluorophenoxy substituted perfluoroalkylene vinyl ethers wherein the perfluoroalkylene group contains from 1 to 5 carbon atoms, N〓C(R′f－O)nCF〓CF2 where R′f is a perfluoroalkylene group of 2 or 3 carbon atoms and n is 1-4, fluoroolefins of 2 to 5 carbon atoms containing 1 or 2 bromo substitutents or fluoroolefins of 2 to 5 carbon atoms, containing 1 or 2 iodo substituents, (B) and from 2 to 50 parts by weight of a thermoplastic perfluorocarbon copolymer containing at least 50 mole % units derived from tetrafluoroethylene having a melting point above 300°C. which is present as generally spherical particles having a particle size of less then about 10 microns, said composition being melt blended at a temperature which is sufficiently high to melt the thermoplastic tetrafluoroethylene copolymer.